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THA02 |
Four-Wave Mixing Using Extreme Ultraviolet Transient Gratings at FERMI FEL | |
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Four-wave mixing (FWM) processes are exploited in the optical domain in a large array of scientific and technological applications. The extension of this approach to the XUV and X-ray range was theoretically conceived,* but not experimentally pursued because of the lack of photon sources with enough brightness and coherence. This situation has changed with the advent of FELs, in particular those stabilized by seeding processes. In this context, the XUV pulses delivered by FERMI have been used to experimentally demonstrate the FWM response stimulated by XUV transient gratings.** More recently the 'twin-seed' double-colour FEL mode of FERMI has been employed in a two-colour XUV FWM experiment.*** These results provide grounds to build up the sophisticated experiments envisioned by theoreticians,* which could provide access to high energy/high-wavevector excitations, with elemental selectivity and nano to atomic spatial resolution. Capabilities that can be exploited in different fields, ranging from thermal transport dynamics in nanoelectronic devices to charge transfer processes in molecules.
* S. Tanaka and S. Mukamel, Phys. Rev. Lett., 2002, 89, 043001 ** F. Bencivenga et al., Nature, 2015, 520, 205 *** F. Bencivenga et al., Faraday Discuss., 2014, 171, 487 |
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